How do I create a datetime in Python from milliseconds?
PythonDatetimePython Problem Overview
How do I create a datetime in Python from milliseconds? I can create a similar Date object in Java by java.util.Date(milliseconds).
> Allocates a Date object and initializes it to represent the specified number of milliseconds since the standard base time known as "the epoch", namely January 1, 1970, 00:00:00 GMT.
Python Solutions
Solution 1 - Python
Just convert it to timestamp
datetime.datetime.fromtimestamp(ms/1000.0)
Solution 2 - Python
What about this? I presume it can be counted on to handle dates before 1970 and after 2038.
target_datetime_ms = 200000 # or whatever
base_datetime = datetime.datetime(1970, 1, 1)
delta = datetime.timedelta(0, 0, 0, target_datetime_ms)
target_datetime = base_datetime + delta
as mentioned in the Python standard lib:
> fromtimestamp() may raise ValueError, if the timestamp is out of the > range of values supported by the platform C localtime() or gmtime() > functions. It’s common for this to be restricted to years in 1970 > through 2038.
Very obviously, this can be done in one line:
target_dt = datetime(1970, 1, 1) + timedelta(milliseconds=target_dt_ms)
Solution 3 - Python
Converting millis to datetime (UTC):
import datetime
time_in_millis = 1596542285000
dt = datetime.datetime.fromtimestamp(time_in_millis / 1000.0, tz=datetime.timezone.utc)
Converting datetime to string following the RFC3339 standard (used by Open API specification):
from rfc3339 import rfc3339
converted_to_str = rfc3339(dt, utc=True, use_system_timezone=False)
# 2020-08-04T11:58:05Z
Solution 4 - Python
Bit heavy because of using pandas but works:
import pandas as pd
pd.to_datetime(msec_from_java, unit='ms').to_pydatetime()
Solution 5 - Python
import pandas as pd
Date_Time = pd.to_datetime(df.NameOfColumn, unit='ms')